1 files changed, 0 insertions, 440 deletions

diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c
deleted file mode 100644
index a9e474bf6385..000000000000
--- a/arch/sparc64/mm/fault.c
+++ /dev/null
@@ -1,440 +0,0 @@
-/*
- * arch/sparc64/mm/fault.c: Page fault handlers for the 64-bit Sparc.
- *
- * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
- * Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz)
- */
-
-#include <asm/head.h>
-
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/sched.h>
-#include <linux/ptrace.h>
-#include <linux/mman.h>
-#include <linux/signal.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/kprobes.h>
-#include <linux/kdebug.h>
-
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/openprom.h>
-#include <asm/oplib.h>
-#include <asm/uaccess.h>
-#include <asm/asi.h>
-#include <asm/lsu.h>
-#include <asm/sections.h>
-#include <asm/mmu_context.h>
-
-#ifdef CONFIG_KPROBES
-static inline int notify_page_fault(struct pt_regs *regs)
-{
-	int ret = 0;
-
-	/* kprobe_running() needs smp_processor_id() */
-	if (!user_mode(regs)) {
-		preempt_disable();
-		if (kprobe_running() && kprobe_fault_handler(regs, 0))
-			ret = 1;
-		preempt_enable();
-	}
-	return ret;
-}
-#else
-static inline int notify_page_fault(struct pt_regs *regs)
-{
-	return 0;
-}
-#endif
-
-static void __kprobes unhandled_fault(unsigned long address,
-				      struct task_struct *tsk,
-				      struct pt_regs *regs)
-{
-	if ((unsigned long) address < PAGE_SIZE) {
-		printk(KERN_ALERT "Unable to handle kernel NULL "
-		       "pointer dereference\n");
-	} else {
-		printk(KERN_ALERT "Unable to handle kernel paging request "
-		       "at virtual address %016lx\n", (unsigned long)address);
-	}
-	printk(KERN_ALERT "tsk->{mm,active_mm}->context = %016lx\n",
-	       (tsk->mm ?
-		CTX_HWBITS(tsk->mm->context) :
-		CTX_HWBITS(tsk->active_mm->context)));
-	printk(KERN_ALERT "tsk->{mm,active_mm}->pgd = %016lx\n",
-	       (tsk->mm ? (unsigned long) tsk->mm->pgd :
-		          (unsigned long) tsk->active_mm->pgd));
-	die_if_kernel("Oops", regs);
-}
-
-static void bad_kernel_pc(struct pt_regs *regs, unsigned long vaddr)
-{
-	printk(KERN_CRIT "OOPS: Bogus kernel PC [%016lx] in fault handler\n",
-	       regs->tpc);
-	printk(KERN_CRIT "OOPS: RPC [%016lx]\n", regs->u_regs[15]);
-	printk("OOPS: RPC <%pS>\n", (void *) regs->u_regs[15]);
-	printk(KERN_CRIT "OOPS: Fault was to vaddr[%lx]\n", vaddr);
-	dump_stack();
-	unhandled_fault(regs->tpc, current, regs);
-}
-
-/*
- * We now make sure that mmap_sem is held in all paths that call 
- * this. Additionally, to prevent kswapd from ripping ptes from
- * under us, raise interrupts around the time that we look at the
- * pte, kswapd will have to wait to get his smp ipi response from
- * us. vmtruncate likewise. This saves us having to get pte lock.
- */
-static unsigned int get_user_insn(unsigned long tpc)
-{
-	pgd_t *pgdp = pgd_offset(current->mm, tpc);
-	pud_t *pudp;
-	pmd_t *pmdp;
-	pte_t *ptep, pte;
-	unsigned long pa;
-	u32 insn = 0;
-	unsigned long pstate;
-
-	if (pgd_none(*pgdp))
-		goto outret;
-	pudp = pud_offset(pgdp, tpc);
-	if (pud_none(*pudp))
-		goto outret;
-	pmdp = pmd_offset(pudp, tpc);
-	if (pmd_none(*pmdp))
-		goto outret;
-
-	/* This disables preemption for us as well. */
-	__asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
-	__asm__ __volatile__("wrpr %0, %1, %%pstate"
-				: : "r" (pstate), "i" (PSTATE_IE));
-	ptep = pte_offset_map(pmdp, tpc);
-	pte = *ptep;
-	if (!pte_present(pte))
-		goto out;
-
-	pa  = (pte_pfn(pte) << PAGE_SHIFT);
-	pa += (tpc & ~PAGE_MASK);
-
-	/* Use phys bypass so we don't pollute dtlb/dcache. */
-	__asm__ __volatile__("lduwa [%1] %2, %0"
-			     : "=r" (insn)
-			     : "r" (pa), "i" (ASI_PHYS_USE_EC));
-
-out:
-	pte_unmap(ptep);
-	__asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
-outret:
-	return insn;
-}
-
-extern unsigned long compute_effective_address(struct pt_regs *, unsigned int, unsigned int);
-
-static void do_fault_siginfo(int code, int sig, struct pt_regs *regs,
-			     unsigned int insn, int fault_code)
-{
-	siginfo_t info;
-
-	info.si_code = code;
-	info.si_signo = sig;
-	info.si_errno = 0;
-	if (fault_code & FAULT_CODE_ITLB)
-		info.si_addr = (void __user *) regs->tpc;
-	else
-		info.si_addr = (void __user *)
-			compute_effective_address(regs, insn, 0);
-	info.si_trapno = 0;
-	force_sig_info(sig, &info, current);
-}
-
-extern int handle_ldf_stq(u32, struct pt_regs *);
-extern int handle_ld_nf(u32, struct pt_regs *);
-
-static unsigned int get_fault_insn(struct pt_regs *regs, unsigned int insn)
-{
-	if (!insn) {
-		if (!regs->tpc || (regs->tpc & 0x3))
-			return 0;
-		if (regs->tstate & TSTATE_PRIV) {
-			insn = *(unsigned int *) regs->tpc;
-		} else {
-			insn = get_user_insn(regs->tpc);
-		}
-	}
-	return insn;
-}
-
-static void do_kernel_fault(struct pt_regs *regs, int si_code, int fault_code,
-			    unsigned int insn, unsigned long address)
-{
-	unsigned char asi = ASI_P;
- 
-	if ((!insn) && (regs->tstate & TSTATE_PRIV))
-		goto cannot_handle;
-
-	/* If user insn could be read (thus insn is zero), that
-	 * is fine.  We will just gun down the process with a signal
-	 * in that case.
-	 */
-
-	if (!(fault_code & (FAULT_CODE_WRITE|FAULT_CODE_ITLB)) &&
-	    (insn & 0xc0800000) == 0xc0800000) {
-		if (insn & 0x2000)
-			asi = (regs->tstate >> 24);
-		else
-			asi = (insn >> 5);
-		if ((asi & 0xf2) == 0x82) {
-			if (insn & 0x1000000) {
-				handle_ldf_stq(insn, regs);
-			} else {
-				/* This was a non-faulting load. Just clear the
-				 * destination register(s) and continue with the next
-				 * instruction. -jj
-				 */
-				handle_ld_nf(insn, regs);
-			}
-			return;
-		}
-	}
-		
-	/* Is this in ex_table? */
-	if (regs->tstate & TSTATE_PRIV) {
-		const struct exception_table_entry *entry;
-
-		entry = search_exception_tables(regs->tpc);
-		if (entry) {
-			regs->tpc = entry->fixup;
-			regs->tnpc = regs->tpc + 4;
-			return;
-		}
-	} else {
-		/* The si_code was set to make clear whether
-		 * this was a SEGV_MAPERR or SEGV_ACCERR fault.
-		 */
-		do_fault_siginfo(si_code, SIGSEGV, regs, insn, fault_code);
-		return;
-	}
-
-cannot_handle:
-	unhandled_fault (address, current, regs);
-}
-
-asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
-{
-	struct mm_struct *mm = current->mm;
-	struct vm_area_struct *vma;
-	unsigned int insn = 0;
-	int si_code, fault_code, fault;
-	unsigned long address, mm_rss;
-
-	fault_code = get_thread_fault_code();
-
-	if (notify_page_fault(regs))
-		return;
-
-	si_code = SEGV_MAPERR;
-	address = current_thread_info()->fault_address;
-
-	if ((fault_code & FAULT_CODE_ITLB) &&
-	    (fault_code & FAULT_CODE_DTLB))
-		BUG();
-
-	if (regs->tstate & TSTATE_PRIV) {
-		unsigned long tpc = regs->tpc;
-
-		/* Sanity check the PC. */
-		if ((tpc >= KERNBASE && tpc < (unsigned long) __init_end) ||
-		    (tpc >= MODULES_VADDR && tpc < MODULES_END)) {
-			/* Valid, no problems... */
-		} else {
-			bad_kernel_pc(regs, address);
-			return;
-		}
-	}
-
-	/*
-	 * If we're in an interrupt or have no user
-	 * context, we must not take the fault..
-	 */
-	if (in_atomic() || !mm)
-		goto intr_or_no_mm;
-
-	if (test_thread_flag(TIF_32BIT)) {
-		if (!(regs->tstate & TSTATE_PRIV))
-			regs->tpc &= 0xffffffff;
-		address &= 0xffffffff;
-	}
-
-	if (!down_read_trylock(&mm->mmap_sem)) {
-		if ((regs->tstate & TSTATE_PRIV) &&
-		    !search_exception_tables(regs->tpc)) {
-			insn = get_fault_insn(regs, insn);
-			goto handle_kernel_fault;
-		}
-		down_read(&mm->mmap_sem);
-	}
-
-	vma = find_vma(mm, address);
-	if (!vma)
-		goto bad_area;
-
-	/* Pure DTLB misses do not tell us whether the fault causing
-	 * load/store/atomic was a write or not, it only says that there
-	 * was no match.  So in such a case we (carefully) read the
-	 * instruction to try and figure this out.  It's an optimization
-	 * so it's ok if we can't do this.
-	 *
-	 * Special hack, window spill/fill knows the exact fault type.
-	 */
-	if (((fault_code &
-	      (FAULT_CODE_DTLB | FAULT_CODE_WRITE | FAULT_CODE_WINFIXUP)) == FAULT_CODE_DTLB) &&
-	    (vma->vm_flags & VM_WRITE) != 0) {
-		insn = get_fault_insn(regs, 0);
-		if (!insn)
-			goto continue_fault;
-		/* All loads, stores and atomics have bits 30 and 31 both set
-		 * in the instruction.  Bit 21 is set in all stores, but we
-		 * have to avoid prefetches which also have bit 21 set.
-		 */
-		if ((insn & 0xc0200000) == 0xc0200000 &&
-		    (insn & 0x01780000) != 0x01680000) {
-			/* Don't bother updating thread struct value,
-			 * because update_mmu_cache only cares which tlb
-			 * the access came from.
-			 */
-			fault_code |= FAULT_CODE_WRITE;
-		}
-	}
-continue_fault:
-
-	if (vma->vm_start <= address)
-		goto good_area;
-	if (!(vma->vm_flags & VM_GROWSDOWN))
-		goto bad_area;
-	if (!(fault_code & FAULT_CODE_WRITE)) {
-		/* Non-faulting loads shouldn't expand stack. */
-		insn = get_fault_insn(regs, insn);
-		if ((insn & 0xc0800000) == 0xc0800000) {
-			unsigned char asi;
-
-			if (insn & 0x2000)
-				asi = (regs->tstate >> 24);
-			else
-				asi = (insn >> 5);
-			if ((asi & 0xf2) == 0x82)
-				goto bad_area;
-		}
-	}
-	if (expand_stack(vma, address))
-		goto bad_area;
-	/*
-	 * Ok, we have a good vm_area for this memory access, so
-	 * we can handle it..
-	 */
-good_area:
-	si_code = SEGV_ACCERR;
-
-	/* If we took a ITLB miss on a non-executable page, catch
-	 * that here.
-	 */
-	if ((fault_code & FAULT_CODE_ITLB) && !(vma->vm_flags & VM_EXEC)) {
-		BUG_ON(address != regs->tpc);
-		BUG_ON(regs->tstate & TSTATE_PRIV);
-		goto bad_area;
-	}
-
-	if (fault_code & FAULT_CODE_WRITE) {
-		if (!(vma->vm_flags & VM_WRITE))
-			goto bad_area;
-
-		/* Spitfire has an icache which does not snoop
-		 * processor stores.  Later processors do...
-		 */
-		if (tlb_type == spitfire &&
-		    (vma->vm_flags & VM_EXEC) != 0 &&
-		    vma->vm_file != NULL)
-			set_thread_fault_code(fault_code |
-					      FAULT_CODE_BLKCOMMIT);
-	} else {
-		/* Allow reads even for write-only mappings */
-		if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
-			goto bad_area;
-	}
-
-	fault = handle_mm_fault(mm, vma, address, (fault_code & FAULT_CODE_WRITE));
-	if (unlikely(fault & VM_FAULT_ERROR)) {
-		if (fault & VM_FAULT_OOM)
-			goto out_of_memory;
-		else if (fault & VM_FAULT_SIGBUS)
-			goto do_sigbus;
-		BUG();
-	}
-	if (fault & VM_FAULT_MAJOR)
-		current->maj_flt++;
-	else
-		current->min_flt++;
-
-	up_read(&mm->mmap_sem);
-
-	mm_rss = get_mm_rss(mm);
-#ifdef CONFIG_HUGETLB_PAGE
-	mm_rss -= (mm->context.huge_pte_count * (HPAGE_SIZE / PAGE_SIZE));
-#endif
-	if (unlikely(mm_rss >
-		     mm->context.tsb_block[MM_TSB_BASE].tsb_rss_limit))
-		tsb_grow(mm, MM_TSB_BASE, mm_rss);
-#ifdef CONFIG_HUGETLB_PAGE
-	mm_rss = mm->context.huge_pte_count;
-	if (unlikely(mm_rss >
-		     mm->context.tsb_block[MM_TSB_HUGE].tsb_rss_limit))
-		tsb_grow(mm, MM_TSB_HUGE, mm_rss);
-#endif
-	return;
-
-	/*
-	 * Something tried to access memory that isn't in our memory map..
-	 * Fix it, but check if it's kernel or user first..
-	 */
-bad_area:
-	insn = get_fault_insn(regs, insn);
-	up_read(&mm->mmap_sem);
-
-handle_kernel_fault:
-	do_kernel_fault(regs, si_code, fault_code, insn, address);
-	return;
-
-/*
- * We ran out of memory, or some other thing happened to us that made
- * us unable to handle the page fault gracefully.
- */
-out_of_memory:
-	insn = get_fault_insn(regs, insn);
-	up_read(&mm->mmap_sem);
-	printk("VM: killing process %s\n", current->comm);
-	if (!(regs->tstate & TSTATE_PRIV))
-		do_group_exit(SIGKILL);
-	goto handle_kernel_fault;
-
-intr_or_no_mm:
-	insn = get_fault_insn(regs, 0);
-	goto handle_kernel_fault;
-
-do_sigbus:
-	insn = get_fault_insn(regs, insn);
-	up_read(&mm->mmap_sem);
-
-	/*
-	 * Send a sigbus, regardless of whether we were in kernel
-	 * or user mode.
-	 */
-	do_fault_siginfo(BUS_ADRERR, SIGBUS, regs, insn, fault_code);
-
-	/* Kernel mode? Handle exceptions or die */
-	if (regs->tstate & TSTATE_PRIV)
-		goto handle_kernel_fault;
-}